
stramm
tight
Firm, close-fitting, or pulled taut. Similar to 'straff' (taut), it is used for clothing, ropes, or a snug fit.
Die neuen Schuhe sitzen anfangs noch etwas stramm.
The new shoes are still a bit tight at first.
tight / upright
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tight
Firm, close-fitting, or pulled taut. Similar to 'straff' (taut), it is used for clothing, ropes, or a snug fit.
Die neuen Schuhe sitzen anfangs noch etwas stramm.
The new shoes are still a bit tight at first.

upright
Taking on an upright, straight, and disciplined posture. Often used in a military context.
Die Soldaten standen stramm, als der General den Raum betrat.
The soldiers stood upright at attention when the general entered the room.

sturdy
Strong, healthy, and well developed. Often used for babies, young people, or animals.
Was für ein strammer Bursche dein Sohn geworden ist!
What a sturdy lad your son has become!

considerable / tough
Colloquial for considerable, substantial, or demanding. It can refer to an achievement, a price, or a distance.
Das war eine stramme Wanderung, wir sind über 20 Kilometer gelaufen.
That was a tough hike; we walked over 20 kilometers.
In the meaning of 'fest' (firm) or 'eng' (tight), 'stramm' is often combined with the verbs 'sitzen' (to fit/sit, for clothing) or 'ziehen' (to pull) and 'spannen' (to tighten/stretch, for ropes or muscles).
Das Seil muss stramm gespannt sein, damit die Wäsche nicht durchhängt.
The rope must be pulled taut so the laundry doesn't sag.
The combination 'stramm stehen' is a fixed expression that describes a disciplined, upright posture, as is common in the military.
Die Kinder standen zum Spaß vor ihren Eltern stramm.
The children stood at attention in front of their parents for fun.
In the meaning of 'kräftig und gesund' (strong and healthy), 'stramm' is used almost exclusively for babies or young men, often in the combinations 'ein strammes Baby' (a sturdy baby) or 'ein strammer Bursche' (a sturdy lad).
Alle bewunderten das gesunde, stramme Baby.
Everyone admired the healthy, sturdy baby.
The meaning of 'beachtlich' (considerable) or 'anstrengend' (demanding) is colloquial. It is often used for prices, achievements, or schedules that are challenging.
Wir haben heute ein strammes Programm vor uns.
We have a tough program ahead of us today.
firm / fixed
Fest and stramm can both describe a snug fit. Fest mainly emphasizes a secure hold, while stramm additionally expresses noticeable tightness or tension. Stramm is therefore especially suitable when something fits very tightly or is already causing some pressure.

Der Stiefel sitzt stramm am Fuß und drückt leicht am Spann.
The boot fits tightly around the foot and puts slight pressure on the instep.
Der Stiefel sitzt fest am Fuß und rutscht beim Gehen nicht.
The boot fits snugly around the foot and does not slip while walking.